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If i use the tun_wg interface with DHCPV6 to push prefixes to peers DHPCV6 stops:

/services_dhcpv6.php: The command '/usr/local/sbin/dhcpd -6 -user dhcpd -group _dhcp -chroot /var/dhcpd -cf /etc/dhcpdv6.conf -pf /var/run/dhcpdv6.pid em1.172 tun_wg0' returned exit code '1', the output was 'Internet Systems Consortium DHCP Server 4.4.2 Copyright 2004-2020 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Config file: /etc/dhcpdv6.conf Database file: /var/db/dhcpd6.leases PID file: /var/run/dhcpdv6.pid Wrote 5 NA, 0 TA, 5 PD leases to lease file. **Bound to *:547 Unsupported device type 23 for "tun_wg0"** If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging. exiting.'

Already asked for package support here: https://github.com/theonemcdonald/pfSense-pkg-WireGuard/issues/79

But this is a more general issue. It should be no problem to use DHCPV6 with L3 interfaces.